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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 24th February 2014, 11:06 PM   #1
Magnetmaz is offline Magnetmaz  United States
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Building the Tubelab SE specifically for #45 tubes.

I have a set of 4400 ohm PP Output Transformers out of 1950's era RCA PA Amplifiers ( that used to push 2x 7027's each ). They are beefy...the amp was supposedly rated at 35 watt. I've got 4/8/16 ohm taps.

I've read all the "PP OT as an SE OT" threads i can find, and while people say it will work, and will work better if you air gap or rearrange the laminations, i'm curious if it's worth trying these things out. Some say it will work fine as is.

Is 4400ohm enough for the #45 tube? I read 5k is ideal, so i will probably end up with more distortion at this lower rate, but...enough for me to notice?

opinions? James are $150 a pair... is it worth trying these out in testing and then "upgrade" to better OT's later? Or will my initial results be unsatisfying enough that i shouldn't bother.
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